ResourceProducer增加required属性

src/main/java/org/redkale/boot/Application.java

@@ -1178,6 +1178,9 @@ public final class Application {
                     throw new RestException("@" + ResourceProducer.class.getSimpleName() + " must on " + MessageProducer.class.getName() + " type field, but on " + field);
                 }
                 MessageAgent agent = findMessageAgent(annotation.mq());
+                if (!annotation.required() && agent == null) {
+                    return;
+                }
                 if (agent == null) {
                     throw new RedkaleException("Not found " + MessageAgent.class.getSimpleName() + "(name = " + annotation.mq() + ") on " + field);
                 }

src/main/java/org/redkale/mq/ResourceProducer.java

@@ -3,9 +3,9 @@
  */
 package org.redkale.mq;
 
+import java.lang.annotation.*;
 import static java.lang.annotation.ElementType.FIELD;
 import static java.lang.annotation.RetentionPolicy.RUNTIME;
-import java.lang.annotation.*;
 import org.redkale.convert.ConvertType;
 
 /**
@@ -25,6 +25,8 @@ public @interface ResourceProducer {
 
     String mq();
 
+    boolean required() default true;
+
     ConvertType convertType() default ConvertType.JSON;
-    
+
 }